Omega reduced Speedmaster spring pin sizing

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Hi,

Does anyone have the spring pin sizing for an Omega Speedmaster reduced, its 18mm lugs but I can't find the recommended bar diameter and the pin/point size which actually goes in the lug hole. I intended to use it with a leather strap but don't want the pins to wriggle in the lug holes.

Thanks in advance.
 
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Proper spring bar for the bracelet is Omega part 068ST2205. For a strap, I would use the slightly longer 068ST2206.

Cheers, Al